Showing papers in "Canadian Journal of Physics in 1970"
TL;DR: In this paper, it was shown that the scattering of ferromagnetic band-electrons by phonons combined with the spin-orbit interaction caused magnetic relaxation of the Landau-Lifshitz-Gilbert type.
Abstract: Scattering of ferromagnetic band-electrons by phonons combined with the spin–orbit interaction is shown to cause magnetic relaxation of the Landau–Lifshitz–Gilbert type. Two formally distinct proce...
298 citations
TL;DR: Mossbauer spectra of 57Fe in the nickel-zinc ferrite system (ZnO)x(NiO)1−xFe2O3 have been obtained, at room temperature and at 77 °K, in zero magnetic field and also in a longitudinal magnetic field.
Abstract: Mossbauer spectra of 57Fe in the nickel–zinc ferrite system (ZnO)x(NiO)1−xFe2O3 have been obtained, at room temperature and at 77 °K, in zero magnetic field and also in a longitudinal magnetic fiel...
191 citations
TL;DR: In this article, the absorption spectrum of the Mg2 molecule, which occurs in a furnace containing Mg vapor, has been photographed with a high resolution spectrograph, and the rotational structures of the bands have been analyzed.
Abstract: The absorption spectrum of the Mg2 molecule, which occurs in a furnace containing Mg vapor, has been photographed with a high resolution spectrograph. The rotational structures of the bands have be...
155 citations
TL;DR: In this article, an interpolation formula for the wave-number and density dependence of the static screening function for an interacting electron gas in its ground state is proposed. But the interpolation is not suitable for the case of a single electron.
Abstract: An interpolation formula is suggested for the wave-number and density dependence of the static screening function for an interacting electron gas in its ground state. The approximate screening func...
151 citations
TL;DR: In this article, resistivity and magnetoresistance data obtained from 77 to 700 °K were presented, which suggest an interpretation based on a strongly spin-polarized conduction band.
Abstract: Resistivity and magnetoresistance data obtained from 77 to 700 °K are presented. These data suggest an interpretation based on a strongly spin-polarized conduction band. A model is developed based ...
135 citations
TL;DR: In this article, the lowest-order Hartree-Fock contributions to the zero frequency screening function were examined for an interacting electron gas in its ground state, and computational methods were developed to treat s...
Abstract: The lowest-order Hartree–Fock contributions to the zero frequency screening function are examined for an interacting electron gas in its ground state. Computational methods are developed to treat s...
126 citations
TL;DR: The Raman spectra of polycrystalline α-nitrogen and α-carbon monoxide have been recorded at 18 °K, using argon-ion and helium-neon laser excitation as mentioned in this paper.
Abstract: The Raman spectra of polycrystalline α-nitrogen and α-carbon monoxide have been recorded at 18 °K, using argon–ion and helium–neon laser excitation. Previously undetected peaks at 60 cm−1 for N2 an...
112 citations
TL;DR: A statistical model based on localized canting, originally proposed by Geller and coworkers, was developed to account for the magnetic properties of substituted ferrimagnets as mentioned in this paper, which is used in this paper.
Abstract: A statistical model based on the concept of localized canting, originally proposed by Geller and coworkers, is developed to account for the magnetic properties of substituted ferrimagnets. This mod...
106 citations
TL;DR: In this paper, rotational analyses have been performed for 12 bands of the 1Au-1Ag (π*n) transition of glyoxal and approximately 15,000 lines have been assigned, and rotational and vibrational constants obtained by...
Abstract: Rotational analyses have been performed for 12 bands of the 1Au–1Ag (π*–n) transition of glyoxal. Approximately 15 000 lines have been assigned, and rotational and vibrational constants obtained by...
102 citations
TL;DR: In this paper, pair correlations on two one-dimensional Ising models with next-nearest-neighbor interactions are calculated exactly, and the zero-field susceptibilities were calculated exactly.
Abstract: Pair correlations on two one-dimensional Ising models with next-nearest-neighbor interactions are calculated exactly. For an appropriate range of values of the interaction energies, each of these models exhibits a disorder point, at which the nature of the short-range order changes abruptly, and at which there is a cusp in the graph of range of order vs. temperature. The zero-field susceptibilities are calculated exactly, and are found to have quite smooth temperature dependence.
96 citations
TL;DR: In this paper, the effects of collisions with ground state H2, HD, D2, N2, CH4, CD4, C2H4, and C 2H6 molecules have been investigated using met...
Abstract: 52P1/2 ↔ 52P3/2 mixing and 52S1/2 ← 52P1/2, 2P3/2 quenching in rubidium, induced in collisions with ground state H2, HD, D2, N2, CH4, CD4, C2H4, and C2H6 molecules, have been investigated using met...
TL;DR: The WKB approximation often provides a useful tool for the study of wave propagation through varying media as discussed by the authors, and the utility of this tool in the case of acoustic-gravity waves, propagating through regio...
Abstract: The WKB approximation often provides a useful tool for the study of wave propagation through varying media. The utility of this tool in the case of acoustic–gravity waves, propagating through regio...
TL;DR: In this article, two tungsten surfaces have been bombarded with helium ions of selected energies between 5 and 2000eV, and the helium thermal desorption spectra obtained when the targets were subsegmented.
Abstract: Two (100) and two (110) tungsten surfaces have been bombarded with helium ions of selected energies between 5 and 2000 eV. The helium thermal desorption spectra obtained when the targets were subse...
TL;DR: The electrical conductivity of pure KI, KI+SrI2, and KI + K2CO3 single crystals was measured as a function of temperature in this paper.
Abstract: The electrical conductivity of pure KI, KI + SrI2, and KI + K2CO3 single crystals was measured as a function of temperature. A method for calculating ionic transport parameters from these results w...
TL;DR: In this article, the authors studied the pressure narrowing of the vibrational Raman bands in N2 and CO and showed that a pressure of about 200 ǫ atm reduces the half-width of the bands by a factor 2.
Abstract: Observations of the pressure narrowing of the vibrational Raman bands in N2 and CO are presented. For both gases a pressure of about 200 atm reduces the half-width of the bands by a factor 2. This behavior is explained in a semiquantitative way by the theory of motional narrowing. Motional narrowing occurs when the frequency of rotationally inelastic collisions reaches the magnitude of the frequency separation of the individual band components.
TL;DR: In this paper, 50 bands have been recorded in emission from glyoxal excited with the 4765, 4880, 4965, 5017, and 5145 A lines of an argon ion laser.
Abstract: Approximately 50 bands have been recorded in emission from glyoxal excited with the 4765, 4880, 4965, 5017, and 5145 A lines of an argon ion laser. Most of the stronger bands are readily assigned to the 1Au–1Ag (π*–n) and 3Au–1Ag (π*–n) systems. Seven bands are tentatively assigned to a new band system, probably a second singlet π*–n system. One Raman band has been observed. The new measurements give ν1″ = 2843 cm−1, ν2″ = 1745 cm−1, and ν4″ = 1065 cm−1.
TL;DR: In this paper, the electronic factor of the electric monopole conversion probability as a function of the atomic charge number Z and transition energy k for K, LI, and LII was presented.
Abstract: This paper presents, in tabular form, the electronic factor of the electric monopole conversion probability as a function of the atomic charge number Z and transition energy k for K, LI, and LII sh...
TL;DR: In this paper, the Stark effect on the rotational lines of the 1+0 band of the 3A2-1A1 transition of formaldehyde has been studied using field strengths up to 25 ǫkV/cm.
Abstract: The Stark effect on the rotational lines of the 1+–0 band of the 3A2–1A1 (π* ← n) transition of formaldehyde has been studied using field strengths up to 25 kV/cm. Measurements of the Stark splitti...
TL;DR: In this article, an electron tunneling investigation has been carried out on quench-condensed Bi, Ga, Pb and Pb∙75Bi∙25, pb ∙50Bi√50, and pb ∼ ∙25Bi ∙75, where the energy gap and transition temperature were measured for each sample.
Abstract: An electron tunneling investigation has been carried out on quench-condensed Bi, Ga, Pb, Pb∙75Bi∙25, Pb∙50Bi∙50, and Pb∙25Bi∙75. The energy gap and transition temperature have been measured for each sample. The tunneling derivative data have been analyzed in terms of the strong-coupling theory of superconductivity by means of a computer program of W. L. McMillan. The effective phonon spectrum, the Coulomb pseudopotential, the complex energy gap function, the pairing self-energy function, and the electron renormalization function have been determined for each sample. Certain parameters based on integrals over the phonon spectrum have also been calculated for each sample.
TL;DR: In this paper, the vibroluminescence of carbon monoxide excited by activated nitrogen was investigated under high resolution in the fundamental and harmonic regions, showing that the rotational population, corrected in some cases for self-absorption, showed a Boltzmann distribution characterized by a rotational temperature of 400 °K.
Abstract: The vibroluminescence of carbon monoxide excited by activated nitrogen is investigated under high resolution in the fundamental and harmonic regions. The rotational population, corrected in some cases for self-absorption, shows a Boltzmann distribution characterized by a rotational temperature of 400 °K, but the vibrational population definitely shows a non-Boltzmann distribution which coincides very accurately with a Treanor-type distribution. This distribution is due, as explained by the theory of Treanor, to the anharmonicity of the molecules and to the inefficiency of the vibration–translation transfer. The variation of the number of vibrational quanta as a function of time allows a determination of the vibration–vibration rate transfer and shows the intervention of a deactivation process interpreted as due to CN radicals. Results in the harmonic region give ratios of the square of matrix elements which are compared with theoretical values and with other experimental values.
TL;DR: The A1II-X1Σ+ transition of the SiH+ molecule has been observed in the emission spectrum of a hollow-cathode discharge through helium containing a trace of silane as discussed by the authors.
Abstract: The A1II–X1Σ+ transition of the SiH+ molecule has been observed in the emission spectrum of a hollow-cathode discharge through helium containing a trace of silane. The analysis of five bands yields...
TL;DR: In this paper, the IMP-A and IMP-B satellites were used to study the effect of polar magnetic substorm onset at the earth's surface on the magnetotail.
Abstract: Using data from the IMP-A and IMP-B satellites, it is shown that when a polar magnetic substorm onset is observed at the earth's surface, there is a pronounced effect in the magnetotail at approxim...
TL;DR: In this paper, the absorption spectrum of iodine has been photographed in the higher orders of a 10.7m concave grating spectrograph in the region 1950-1200 A. The limit of the Rydberg series leading to the 2Π3/2g state of the molecular ion has been recorded and the corresponding ionization potential is found to be 75 814 ± 10 10
Abstract: The absorption spectrum of iodine has been photographed in the higher orders of a 10.7 m concave grating spectrograph in the region 1950–1200 A. A number of band systems has been obtained, most of which correspond to Rydberg transitions. The limit of the Rydberg series leading to the 2Π3/2g state of the molecular ion has been recorded and the corresponding ionization potential is found to be 75 814 ± 10 cm−1. Five series have been found which terminate at this common limit. They represent transitions from the ground state to [σg2πu4Πg32Π3/2g]np σu Π1u, [σg2πu4πg32Π3/2g]np πu Σ+ (0u+), [σg2πu4πg32Π3/2g]nf σu Π1u, [σg2πu4πg32Π3/2g]nf πu, Σ+(0u+), and [σg2πu4πg32Π3/2g]nf δu Π1u states respectively, where n takes the running values 6, 7, 8, … etc. for the first three series and 4, 5, 6, … etc. for the last two series. The series limit of the bands corresponding to the molecules with ν″ = 1 has been found to be at 75 600 ± 10 cm−1. The first few members of similar series corresponding to transitions to differe...
TL;DR: In this article, the magnetic moment of several ferromagnetic face-centered-cubic iron-nickel alloys in the invar region has been investigated at low temperatures, as a function of both the magnetic field and the temperature.
Abstract: The magnetic moment of several ferromagnetic face-centered-cubic iron–nickel alloys in the invar region have been investigated at low temperatures, as a function of both the magnetic field and the temperature. A vibrating-sample magnetometer was used, for which relative changes in the moment of 3 parts in 105 could be resolved. Such resolution has permitted a detailed analysis of the temperature dependence of ΔM/M, the relative deviation of the magnetic moment from its value at 0 K, in terms of a contribution arising from spin-wave excitations, varying as T3/2, and one from single-particle excitations, varying as T2, both of these at constant volume, together with a term describing the effect of volume dilation on the moment. The fits to the data for H = 10 kOe yield, for 34 at. % Ni:and for 40 at. %Ni:
TL;DR: In this paper, the dominant processes in slow collisions of protons and 1s hydrogen atoms are direct elastic scattering, resonant charge exchange, and direct and exchange excitations of H(2p).
Abstract: The dominant processes in slow collisions (E < 0.5 keV) of protons and 1s hydrogen atoms are direct elastic scattering, resonant charge exchange, and direct and exchange excitations of H(2p). Differential cross sections have been calculated for all these events by both quantal and classical methods, and characteristics of the resulting Lyman–α (Ly–α) radiation determined.Significant differences from earlier calculations are found for excitation probability, polarization of Ly–α, and the interference oscillations in the charge exchange probability. The phase of the latter is a sensitive function of the interactions causing inelastic scattering. The source of discrepancy with earlier results is the use of the impact parameter approximation (straight-line trajectories); over the range of significant excitation probability, classical path methods using true trajectories give accurate inelastic parameters. Comparison of quantal and classical calculations shows that accurate results for all properties discussed...
TL;DR: The effective ion-ion interaction for sodium was calculated from a fundamental basis, using a one-orthogonalized plane wave (OPW) bare electron ion matrix element, and the Geldart and Taylor elect... as discussed by the authors.
Abstract: The effective ion–ion interaction for sodium is calculated from a fundamental basis, using a one-orthogonalized plane wave (OPW) bare electron – ion matrix element, and the Geldart and Taylor elect...
TL;DR: The forbidden d3Δi−X1Σ+ transition of CO has been observed in absorption at high resolution in the vacuum ultraviolet region as mentioned in this paper, where the intensity distribution in the rotational structure of the observed...
Abstract: The forbidden d3Δi–X1Σ+ transition of CO has been observed in absorption at high resolution in the vacuum ultraviolet region. The intensity distribution in the rotational structure of the observed ...
TL;DR: In this paper, an electronic emission spectrum has been obtained from a carrier identified as the diatomic molecule TiN, which occurs in the red, and it appears to be the analogue of the orange-red systems of the isoelectronic molecules CaF and ScO.
Abstract: An electronic emission spectrum has been obtained from a carrier identified as the diatomic molecule TiN. The system, which occurs in the red, has been analyzed as 2Πr → (X)2Σ, and it appears to be the analogue of the orange–red systems of the isoelectronic molecules CaF and ScO.The lower (ground?) state has B0″ = 0.6211 cm−1 corresponding to r0″ = 1.583 A, whereas the excited 2Πr state has B0′ = 0.6103 cm−1. The system has a well-defined homogeneous perturbation in the excited state, showing the presence of a second, unobserved, 2Π term.
TL;DR: The polarization sensitivity of a single rectangular Ge(Li) detector has been studied as a function of energy using gamma rays of known linear polarization produced in (p,p′γ) reactions and results were in quantitative agreement with calculations made using the Klein–Nishina formula.
Abstract: The polarization sensitivity of a single rectangular Ge(Li) detector 40 × 25 × 3.5 mm has been studied as a function of energy using gamma rays of known linear polarization produced in (p,p′γ) reac...
TL;DR: In this article, the first triplet-singlet system of glyoxal (3Au-1Ag) was photographed in absorption and in magnetic rotation using high resolving power.
Abstract: Twenty-one bands of the first triplet–singlet system of glyoxal (3Au–1Ag) have been photographed in absorption and in magnetic rotation using high resolving power. Analysis yields the following vib...